Never Thought This Would Happen Again.

My sister is two years older than I am and when I was about twelve she got very curious about boys and wanted to explore me, I was also allowed to do the same with her and we had like five years of fun off and on. The summers were usually when we did the most because we had the house to ourselves every day so crazy things would happen, she was very into role play and enjoyed being tied up and sexually played around with telling me what she wanted done and also letting me come up with things. When she started college we never really picked up playing around again, she had a boyfriend then got married, I started working and joined the military retiring from it as soon as I could then started working for the post office back here locally.
She ended up divorced about three years ago, I helped her out getting things fixed around her house and what not, moral support and she is pretty tough anyways so seemed to handle it okay. We talk on the phone and text often so like a year ago I am sitting around on a weekend evening, not much going on just relaxing and I get this text from her that reads If I came over would you want to tie me up and do things again? I sat there reading it a few times going Really? Is she just messing around with me or something?
We are certainly not young and fit anymore, she is in better shape than I am and has really large breasts, always wondered what they would be like now because they seemed pretty firm really. So I reply back telling her I have some rope if she is game and wonder where this going to end up, she replies pretty much right back saying she is on her way over. I am reading her reply and thinking, OH! Crap, do I have rope? Luckily I find some minutes before she pulls up, along with some twine that I am thinking will work nicely winding around those big boobs and maybe make them really stand up. I am still just amazed at how this all was going that evening, she shows up and is excited about it, basically says Hi and wants to know where I want her and is holding this shoulder bag with sex toys in it for me to use on her.
Not to bore you with tie up details but I ended up putting her into a legs bent and spread out, arms stretched out above her for plenty of boob access, twine worked pretty well making them stand up nicely when tied together after wrapping them pretty good. I see these clamps in the bag and ask her what she uses these for and she said they go on her nipples or pussy lips if I want to, nipples it is I thought and learned how the work really enjoying the results.
I started out licking her pussy mainly because it had been a while for me, plenty of extra play with my fingers both tickling and fucking her with them also, she had a great orgasm according to her then she said something that really had me going. She said she loved what I did with her boobs and I should titty fuck her and she will suck me also. So a few minutes later I am pushing my cock thru them and she is licking the head of it until I started getting nice and hard, always the idea person she says between licks I should play with her nipples also, pulling and pinching them some and in my mind I am thinking How does she not have a boyfriend to do this with, men would be lining up for this. I ask her if she wants to swallow, she says my choice whatever I want to do so just kept up the motion and came in her mouth.
I get back off of her and start undoing her, she says What? you are done already? Give me another orgasm with some of the toys, keep playing around with me please it has been a while. So as I am turning on a vibrator and staring at this huge dildo also I asked her saying surely there were other men she could be doing this with so why me again. She replied right back saying she trusted me and most guys these days are fucking assholes. She goes on telling me she had her ex tie her up a few times then he screwed it up by doing things to her that she did not want done like anal and gagging her with deep throating, he actually bought a mouth ring gag and forced his cock right down there making her gag and puke. She thought she was going to choke on her own vomit one time, could not even trust her own husband not to go too far with things.
So I just enjoy playing around with her again, things are still really good between us and she is a lot of fun sexually even though we are both older now.